A method for enhancing anaerobic arsenic oxidation by microorganisms in natural water system sediments

Abstract

The present application belongs to the field of environmental microorganism and heavy metal pollution control technology, and particularly relates to a method for enhancing anaerobic arsenic oxidation of microorganisms in natural water system sediment system. The method retains the original microbial community of the natural water system sediment system, adds nitrate as an electron acceptor to the arsenic-containing sediment system, and introduces dissolved organic matter from the same water system raw water concentrate under light conditions to promote the conversion of arsenite to arsenate by microorganisms using its photosensitivity, thereby further enhancing the anaerobic oxidation process of arsenic. The present application does not require exogenous functional bacteria inoculation, artificial photosensitizer or electrode material, and can realize the oxidation and immobilization of arsenic under near-natural conditions, and is suitable for in-situ or near-in-situ regulation and remediation of arsenic pollution in sediment systems such as rivers, lakes, tailings ponds and paddy fields.

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